A portable air purifier may include at least one blower fan which rotates with respect to a rotational shaft extending in a first direction, and includes a hub, and a plurality of fan blades radially connected around the hub; and a fan cover provided with at least one shielding plate that shields the hub, and a plurality of guide vanes that guides a discharge direction of air discharged by the at least one blower fan. A foreground of a rotational area of the plurality of fan blades forms a blowing surface, and the plurality of guide vanes may be arranged in front of the blowing surface and extend radially with respect to the rotational shaft. Each of the plurality of guide vanes may include a first guide surface positioned adjacent to the at least one blower fan and a second guide surface connected to the first guide surface and positioned further from the at least one blower fan than the first guide surface. The second guide surface may extend parallel to the first guide surface. The first guide surface may be oriented at a predetermined angle with respect to the blowing surface.

A purification device of baby carriage is provided and includes a main body, a purification unit, a gas guider and a gas detection module. The purification unit, the gas guider and the gas detection module are disposed in the main body to guide the gas outside the main body through the purification unit for filtering and purifying the gas, and discharge a purified gas. The gas detection module detects particle concentration of suspended particles contained in the purified gas. The gas guider is controlled to operate and export a gas at an airflow rate within 3 minutes. The particle concentration of the suspended particles contained in the purified gas, which is filtered by the purification unit, is reduced to and less than 0.75 μg/m.sup.3. Consequently, the purified gas is filtered, and the baby inside the baby carriage can breathe with safety.

Disclosed in certain embodiments are systems for removing pollutants from an air flow, which may include a substrate and a catalyst-adsorbent material disposed on the substrate.

An agricultural vehicle has an operator environment with a roof portion, and an air treatment apparatus installed within the roof portion. The air treatment apparatus includes a vehicle HVAC system having an inlet plenum, other HVAC components and an outlet to the operator environment. The air treatment apparatus further includes an air filtration system having at least one external inlet and first and second filtration devices located between the external inlet and the HVAC inlet plenum. The roof portion is a hollow structure having upper and lower surfaces and front, rear, left and right sidewalls, and the first and second air filtration devices are disposed along one of the left and right sidewalls within the hollow structure of the roof portion. The HVAC system is preferably disposed along the rear sidewall within the hollow structure of the roof portion.

A coating solution for producing a biofunctional surface coating and/or depth coating of a filter medium may include a solvent, an anti-pathogenic substance, an ion exchanger, and a polymeric cross-linking agent. The ion exchanger may be hygroscopic and may include functional cation exchanger groups with sulphonic acid groups.

A photocatalyst filtration system for a vehicle includes a housing having an airflow path, and a filter configured to filter air flowing in the airflow path, the filter having a first photocatalyst and a second photocatalyst. The system further includes a first ultraviolet (UV) light source disposed proximate the filter and configured to energize the first photocatalyst, and a second UV light source disposed proximate the filter and configured to produce light having a shorter wavelength than light produced by the first UV light source, and configured to energize the second photocatalyst. One of the first photocatalyst or the second photocatalyst is configured to remove odor from the air. The other of the first photocatalyst or the second photocatalyst is configured to remove bacteria from the air.

A vehicle heating, ventilation, and air conditioning (HVAC) system including a cabin air filter, a sensor for providing a sensor reading, and a controller for determining a feedback signal from the sensor reading, wherein the controller determines a cabin air filter expected blockage level from the feedback signal. The feedback signal relates to a usage modifier of the cabin air filter, wherein the controller at east partially adjusts the estimated usage the cabin air filter from the usage modifier.

The present invention relates to a cabin filter unit, and may comprise: a HEPA filter; and carbon block filters placed at the rear end of the HEPA filter, wherein each of the carbon block filters has a structure which has multiple perforations formed and distributed throughout the entire area thereof for the flow of air, and is formed to satisfy the perforation ratio of 30-50% with reference to 07-10, two or more carbon block filters being stacked, and disposed to be in close contact with each other or spaced apart from each other.

An air filtration system for a vehicle includes a first inlet assembly. A second inlet assembly is in fluid communication with the first inlet assembly. A first fan is disposed within a housing and is in fluid communication with the first inlet assembly. A second fan is disposed within the housing and is in fluid communication with the second inlet assembly. A light source is disposed within the housing proximate the first and second fans. The light source emits ultraviolet light. A filter is disposed within the housing proximate the first and second fans. An outlet is in fluid communication with the first and second inlet assemblies. Air is drawn into the housing by the first and second fans, subjected to the ultraviolet light, and expelled via the outlet.

An antimicrobial, injection molded air register for use in an air distribution system to direct airflow from ductwork into a passenger cabin of a vehicle or into an enclosed space within a residential structure is provided. The air register includes a perforated cover configured to cover an outlet end of the ductwork and a plurality of injection molded components supported by the cover to direct air flow into the passenger cabin. Each of the components includes a surface layer in fluid communication with the airflow and is made of a molded material which absorbs airborne liquid droplets containing infectious, disease-causing pathogens moving with the airflow. The molded material includes antimicrobial agents disbursed throughout each of the surface layers to reduce the number of pathogens contained within droplets absorbed by the surface layers.